/**
 * Copyright 2009 http://anhquan.de
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package de.anhquan.config4j;

import java.lang.reflect.Proxy;
import java.util.Map;

import org.apache.commons.collections.map.HashedMap;

import de.anhquan.config4j.internal.ConfigHandler;
import de.anhquan.config4j.internal.ConfigurationDataStore;
import de.anhquan.config4j.internal.ConfigurationProvider;

@SuppressWarnings("unchecked")
public class ConfigFactory {

	private static Map<Class<? extends Config>, Config> instances = new HashedMap();

	private static ConfigurationProvider configuration = new ConfigurationDataStore();
	
	public static <T extends Config> T getConfig(Class<T> configType) {
		
		T configInst = (T) instances.get(configType);
		if (configInst != null) {
			return configInst;
		}

		ClassLoader classLoader = configType.getClassLoader();
		Class[] classes = { configType };
		ConfigHandler handler = new ConfigHandler(configType, configuration);
		Object proxy = Proxy.newProxyInstance(classLoader, classes, handler);
		configInst = (T) proxy;
		instances.put(configType, configInst);
					
		return configInst;
	}

}